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weeds laughing at my roundup

Discussion in 'Pesticide & Herbicide Application' started by bobbygedd, Jul 21, 2002.

  1. bobbygedd

    bobbygedd LawnSite Fanatic
    from NJ
    Messages: 10,178

    im trying to clear an area, it contains honeysuckle, english ivy, myrtle, and assorted weeds. ive been using a roundup concentrate mixed at 2 oz per gal of water, im getting some browning on the leave tips, but for the most part the stuff looks it isnt dying. i did 2 apps in the last 3 weeks. can i use something else? need to give it more time? im not used to this method of killing things, i usually clear an area by hand before landscaping, but this is too much. thanks for advice.
  2. Mowingman

    Mowingman LawnSite Platinum Member
    from Texas
    Messages: 4,717

    If it is hot and dry, the plants will not take in the Roundup properly I have discovered. The dry heat causes the plants to sort of go dormant. Also, I use 3 oz/gal. on tough weeds like you describe, and I add a few drops of liquid detergent to every gallon to act as a dispersing agent on plants that have shiny leaves. I usually give it 10 days to two weeks to kill the weeds before I give up and spray again. Hope this helps.:)
  3. joshua

    joshua LawnSite Bronze Member
    Messages: 1,226

    good luck with this heat, it is tough to kill weeds when its hotter than 85
  4. MOW ED

    MOW ED LawnSite Fanatic
    Messages: 5,028

    Too bad ya live in Jerzee. Mayby you can just try the Pro Dry.


    Round Up Pro Dry. + Scythe

    71% glyphosate 1 - 1.5oz dry packet
    4 oz liquid Scythe (not for sale in MA, NY, NJ, CT, VT, HI, AK)
    1 gallon water

    treats about 500 sq ft , QUICKLY.
  5. tremor

    tremor LawnSite Bronze Member
    Messages: 1,476

    No weeds will roll over & die when the growth has slowed like it has. Earlier in the season is best to take advantage of active growth.

    For the record: RoundUp is not the most stellar performer on woody brush to begin with. Roundup is also not a very fast herbicide. But that's why it works so well. It takes time for the Glyphosate molecules to translocate (move) throughout the vascular system of a plant. The slower a plant is growing, the longer this process takes. Under the best of conditions, Roundup still isn't "fast" by most peoples standards. No matter what surfactants Monsanto has added (to date) either.

    I just recently treated such an area behind my neighbors garage. My motivation was security & the Poison Ivy oils that will eventually get on my "outdoor cat" & potentially give to my son.

    Working for a manufacturer/distributor means I have access to a LOT of different products. All the same I used the following cocktail:

    Round Up Pro Dry @ 1.5 oz/gal (2%)
    (there were grasses in the over growth)

    Scythe Nonselective @ 4 oz/gal
    (helps break through waxy cuticles, death in hours or days, & improved summer performance. A classic "burn-down" contact herbicide. Lightning fast! Not a complete kill by itself though, more like a weed wacker than a herbicide since it doesn't translocate.)

    LESCO 3-Way Ester 2 @ 1.5 oz/gal
    (2,4-D does a great job on woodies that Roundup has trouble with. Lends permanence via conventional systemic activity)

    To this cocktail I might have added Dimension Ultra or Surflan or Sarhara or some other residual herbicide if I didn't want anything to grow at all. Since it's late in the year, I decided that wasn't an important issue. Plus the guy behind my neighbor values the trees in the area which may have been damaged by the Sahara. You wou

    I may still have to retreat this area for the Poison Ivy in the fall. I doubt I got all the roots. But you should see what it looks like right now! After the first week there wasn't a trace of green left back there! And it's in partial shade. Were it in the sun, the Scythe would have burned down the foliage by the following day, with visual symptoms starting before I had finished spraying.

    Hope this helps,
  6. HBFOXJr

    HBFOXJr LawnSite Bronze Member
    Messages: 1,712

    Bob, I think, but am not sure, that if you read the label you'll find you need a stronger solution than what you are using. I thought bottom end concentration was about a 2% solutionfor soft annual stuff and up to 10% for tough perennial, woody, viney stuff. Of course some newer versions of the product can have different specs.

    Weather conditions as stated by others make a difference.

    Timing can make a difference. Some tough stuff is better killed in late summer early fall while others are easy in the spring. Soft stuff can be killed at anytime.

    I've personally used Lesco 3-way and Trimec with a sticker spreader in late summer to fall to kill anything I didn't like other than grasses. Knocks the life out of poison ivy, virginia creeeper etc. Use at maximum mix recommendation and spray till wet.
  7. Tordonista

    Tordonista LawnSite Member
    Messages: 36

    Adding an equal amount of 24D to the RU will give you better burn. Remember, both of those are topkills. Lots of tough stuff will come back.
  8. HBFOXJr

    HBFOXJr LawnSite Bronze Member
    Messages: 1,712

    Round Up & 2,4,d are systemics and not top kills. They go to the roots.
  9. Tordonista

    Tordonista LawnSite Member
    Messages: 36

    Yes, and Santa Claus ate my milk and cookies last Christmas Eve.
    And those are not the same perennial weeds I sprayed 2 weeks or a month ago.
    they're both great for what they do, but don't give them more credit than they deserve.
  10. gusbuster

    gusbuster LawnSite Bronze Member
    Messages: 1,930

    There are better products out their than round up pro or Lesco knock off of round up.

    Myself, I use a part round up and turflon of esther to get rid of Ivy. And yes, it is a mutiple treatment. Sometimes I'll mix in some trimec(2 4 d ) to nail what I'm trying to kill wether it's Ivy, poison Ivy or Poison Oak.

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